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16 January 2012 - 04:05 PM
Having just conducted a experiment in which I levitated a small neodymium magnet above a liquid nitrogen cooled YCBO superconductor, I was wondering if anyone knew of any factors that affect the height at which the magnet levitates at (e.g does magnet strength affect it?), and whether this applies inversely (i.e does a stronger magnet allow a superconductor to levitate higher above it?). In addition, I was wondering whether anyone could think up an inexpensive (under £100, ($~170)) way to keep liquid nitrogen above the superconductor, which is 1" in diameter, in order that it remains at its critical temperature. I had thought of a half ping-pong ball and have yet to try that out - however, there is little insulation provided by that, so it would only work for a short while.
Sorry for the long post...
Any ideas would be very welcome.
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Quantum Levitation and factors affecting
What factors affect the height that a superconductor levitates at?
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#2
16 January 2012 - 04:18 PM
Tres Juicy 
Molecule
"an inexpensive (under £100, ($~170)) way to keep liquid nitrogen above the superconductor"
What do you mean here? Do you want to float it above?
What do you mean here? Do you want to float it above?
This post has been edited by Tres Juicy: 16 January 2012 - 04:19 PM
A fencing instructor named Fisk
In duels was terribly brisk
So much that in action
The Fitzgerald contraction
Reduced his foil to a disk
Like all good science, I pose more questions than I answer
In duels was terribly brisk
So much that in action
The Fitzgerald contraction
Reduced his foil to a disk
Like all good science, I pose more questions than I answer
Spoiler
- Posts: 635 | Joined: 01-December 11
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#3
16 January 2012 - 06:13 PM
SanjayBeast
Lepton
no, i want a way to keep the superconductor cold - i.e., hold the liquid nitrogen above it (in a cup attached? i don't know...) without using a sapphire crystal wafer to insulate it
- Posts: 5 | Joined: 16-January 12
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#4
16 January 2012 - 06:20 PM
Klaynos
Insert Witty Comment
How long do you want to keep it cool for, a few mins, hours, days?
We use trays similar to this:
http://www.wondermag...rconductor.html
But with a raised up area for the superconductor to rest on.
We use trays similar to this:
http://www.wondermag...rconductor.html
But with a raised up area for the superconductor to rest on.
Klaynos - share and enjoy.
- Posts: 6,801 | Joined: 19-November 04
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#5
17 January 2012 - 07:14 AM
SanjayBeast
Lepton
i used a tray like that in my demo a few days ago - but this time i want the superconductor to be floating on top of a very large magnet, not levitating a small neodymium magnet above it! This means that the superconductor will be out of the liquid nitrogen and so i need to find some way of making it so i can have liquid nitrogen near it (or on it), or just a way of insulating it so that having cooled it, it stays could for ~1 minute
- Posts: 5 | Joined: 16-January 12
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#6
17 January 2012 - 08:40 AM
Tres Juicy
Molecule
What about putting it inside a bag and having it wrapped around the magnet?
A fencing instructor named Fisk
In duels was terribly brisk
So much that in action
The Fitzgerald contraction
Reduced his foil to a disk
Like all good science, I pose more questions than I answer
In duels was terribly brisk
So much that in action
The Fitzgerald contraction
Reduced his foil to a disk
Like all good science, I pose more questions than I answer
Spoiler
- Posts: 635 | Joined: 01-December 11
- Reply
#7
17 January 2012 - 06:34 PM
SanjayBeast
Lepton
having the bag wrapped around the superconductor and filled with liquid nitrogen? could work, i just wonder whether there is a plastic bag that wouldn't become brittle and break...
- Posts: 5 | Joined: 16-January 12
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#8
17 January 2012 - 06:53 PM
Tres Juicy
Molecule
SanjayBeast, on 17 January 2012 - 06:34 PM, said:
having the bag wrapped around the superconductor and filled with liquid nitrogen? could work, i just wonder whether there is a plastic bag that wouldn't become brittle and break...
That was my concern, but I thought it would be worth a go...
A fencing instructor named Fisk
In duels was terribly brisk
So much that in action
The Fitzgerald contraction
Reduced his foil to a disk
Like all good science, I pose more questions than I answer
In duels was terribly brisk
So much that in action
The Fitzgerald contraction
Reduced his foil to a disk
Like all good science, I pose more questions than I answer
Spoiler
- Posts: 635 | Joined: 01-December 11
- Reply
#9
17 January 2012 - 08:28 PM
SanjayBeast
Lepton
to get back to the main point (cos i have a decentish idea for insulation now, though more would be appreciated), does anyone know whether the strength of the magnet used is proportional to the height that the superconductor levitates at? cos if so, then I'm gonna go ahead and spend £75 on a 26kg force magnet 
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